package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    /**
     * 因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象，
     * 比如service和mapper，不能实现数据库操作（可以手写jdbc操作数据库，不推荐）。
     */
    //这里手动引入EduSubjectService,用来做增删改查
    private EduSubjectService subjectService;

    //无参
    public SubjectExcelListener() {
    }

    //有参
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    /**
     * 读取excel内容，一行一行进行读取 (读取excel，新增一二级分类)
     * @param subjectData
     * @param analysisContext
     */
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {

        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }

        //一行一行读取，每次读取有两个值，第一个值是一级分类，第二个值是二级分类（该excel一行就两个属性）
        // 添加一级分类
        // 判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) {
            //新增一级分类
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }

        //获取一级分类id值
        String pid = existOneSubject.getId();

        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }

    }

    //判断一级分类是否重复（不能重复）
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        return subjectService.getOne(wrapper);
    }

    //判断二级分类是否重复（不能重复）
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        return subjectService.getOne(wrapper);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }



    public class SubjectExcelListener2 extends AnalysisEventListener<SubjectData> {

        //读取excel内容，一行一行进行读取
        @Override
        public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
            if(subjectData == null) {
                throw new GuliException(20001,"文件数据为空");
            }

            //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
            //判断一级分类是否重复
            EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
            if(existOneSubject == null) { //没有相同一级分类，进行添加
                existOneSubject = new EduSubject();
                existOneSubject.setParentId("0");
                existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
                subjectService.save(existOneSubject);
            }

            //获取一级分类id值
            String pid = existOneSubject.getId();

            //添加二级分类
            //判断二级分类是否重复
            EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
            if(existTwoSubject == null) {
                existTwoSubject = new EduSubject();
                existTwoSubject.setParentId(pid);
                existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
                subjectService.save(existTwoSubject);
            }
        }

        //判断一级分类不能重复添加
        private EduSubject existOneSubject(EduSubjectService subjectService,String name) {
            QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
            wrapper.eq("title",name);
            wrapper.eq("parent_id","0");
            EduSubject oneSubject = subjectService.getOne(wrapper);
            return oneSubject;
        }

        //判断二级分类不能重复添加
        private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {
            QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
            wrapper.eq("title",name);
            wrapper.eq("parent_id",pid);
            EduSubject twoSubject = subjectService.getOne(wrapper);
            return twoSubject;
        }

        @Override
        public void doAfterAllAnalysed(AnalysisContext analysisContext) {

        }
    }
}
